<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>注册页面</h1>
  <input type="text" placeholder="用户名" v-model="user.username">
  <input type="password" placeholder="密码" v-model="user.password">
  <input type="text" placeholder="昵称" v-model="user.nickname">
  <input type="button" value="注册" @click="reg()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.6.14/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
          user:{username:"",password:"",nickname:""}

        },
        methods:{
            reg() {
              //发出异步post请求
              axios.post("/reg",v.user).then(function (response) {
                if(response.data==1) {
                  alert("注册成功!");
                  location.href="/";
                }else {
                  alert("用户名已存在!");
                }
              })
            }
        }
    })
</script>
</body>
</html>